| // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| library shelf_packages_handler.dir_handler; |
| |
| import 'dart:async'; |
| |
| import 'package:path/path.dart' as p; |
| import 'package:shelf/shelf.dart'; |
| |
| /// A utility handler that mounts a sub-handler beneath a directory name, |
| /// wherever that directory name appears in a URL. |
| /// |
| /// In practice, this is used to mount a [PackagesHandler] underneath |
| /// `packages/` directories. |
| class DirHandler { |
| /// The directory name to look for. |
| final String _name; |
| |
| /// The inner handler to mount. |
| final Handler _inner; |
| |
| DirHandler(this._name, this._inner); |
| |
| /// The callback for handling a single request. |
| FutureOr<Response> call(Request request) { |
| var segments = request.url.pathSegments; |
| for (var i = 0; i < segments.length; i++) { |
| if (segments[i] != _name) continue; |
| return _inner(request.change(path: p.url.joinAll(segments.take(i + 1)))); |
| } |
| |
| return new Response.notFound("Not found."); |
| } |
| } |